You're actually right. I'm a software engineer but taught myself electrics, plumbing and carpentry over the years to carry out repairs to my home. I've fitted a whole bathroom on my own and did all the wiring on an extension I had built in my house. I'm sure I'm capable of getting work as a plumber or electrician if things go to pot (carpentry is probably a bit too dangerous as you're breathing in dust all day) but I really don't relish the idea of that. It's hard physical labor, I like getting paid to sit in my nice warm house to mess around with computers.